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author | Christoph Hellwig <hch@lst.de> | 2006-01-13 18:04:00 (GMT) |
---|---|---|
committer | James Bottomley <jejb@mulgrave.(none)> | 2006-01-14 16:55:05 (GMT) |
commit | e02f3f59225d8c3b2a0ad0dc941a09865e27da61 (patch) | |
tree | 37d2931f5d24dc063d9606ec6b5e8db359b439c7 /drivers/scsi/scsi_transport_sas.c | |
parent | 6d5b0c315e0c14f8a0fe274eda7676d62cbd8584 (diff) | |
download | linux-e02f3f59225d8c3b2a0ad0dc941a09865e27da61.tar.xz |
[SCSI] remove target parent limitiation
When James Smart fixed the issue of the userspace scan atributes
crashing the system with the FC transport class he added a patch to
let the transport class check if the parent is valid for a given
transport class.
When adding support for the integrated raid of fusion sas devices
we ran into a problem with that, as it didn't allow adding virtual
raid volumes without the transport class knowing about it.
So this patch adds a user_scan attribute instead, that takes over from
scsi_scan_host_selected if the transport class sets it and thus lets
the transport class control the user-initiated scanning. As this
plugs the hole about user-initiated scanning the target_parent hook
goes away and we rely on callers of the scanning routines to do
something sensible.
For SAS this meant I had to switch from a spinlock to a mutex to
synchronize the topology linked lists, in FC they were completely
unsynchronized which seems wrong.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'drivers/scsi/scsi_transport_sas.c')
-rw-r--r-- | drivers/scsi/scsi_transport_sas.c | 42 |
1 files changed, 24 insertions, 18 deletions
diff --git a/drivers/scsi/scsi_transport_sas.c b/drivers/scsi/scsi_transport_sas.c index e950435..fb6641b 100644 --- a/drivers/scsi/scsi_transport_sas.c +++ b/drivers/scsi/scsi_transport_sas.c @@ -29,6 +29,7 @@ #include <linux/slab.h> #include <linux/string.h> +#include <scsi/scsi.h> #include <scsi/scsi_device.h> #include <scsi/scsi_host.h> #include <scsi/scsi_transport.h> @@ -62,7 +63,7 @@ struct sas_internal { struct sas_host_attrs { struct list_head rphy_list; - spinlock_t lock; + struct mutex lock; u32 next_target_id; }; #define to_sas_host_attrs(host) ((struct sas_host_attrs *)(host)->shost_data) @@ -165,7 +166,7 @@ static int sas_host_setup(struct transport_container *tc, struct device *dev, struct sas_host_attrs *sas_host = to_sas_host_attrs(shost); INIT_LIST_HEAD(&sas_host->rphy_list); - spin_lock_init(&sas_host->lock); + mutex_init(&sas_host->lock); sas_host->next_target_id = 0; return 0; } @@ -626,7 +627,7 @@ int sas_rphy_add(struct sas_rphy *rphy) transport_add_device(&rphy->dev); transport_configure_device(&rphy->dev); - spin_lock(&sas_host->lock); + mutex_lock(&sas_host->lock); list_add_tail(&rphy->list, &sas_host->rphy_list); if (identify->device_type == SAS_END_DEVICE && (identify->target_port_protocols & @@ -634,7 +635,7 @@ int sas_rphy_add(struct sas_rphy *rphy) rphy->scsi_target_id = sas_host->next_target_id++; else rphy->scsi_target_id = -1; - spin_unlock(&sas_host->lock); + mutex_unlock(&sas_host->lock); if (rphy->scsi_target_id != -1) { scsi_scan_target(&rphy->dev, parent->number, @@ -661,9 +662,9 @@ void sas_rphy_free(struct sas_rphy *rphy) struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent->parent); struct sas_host_attrs *sas_host = to_sas_host_attrs(shost); - spin_lock(&sas_host->lock); + mutex_lock(&sas_host->lock); list_del(&rphy->list); - spin_unlock(&sas_host->lock); + mutex_unlock(&sas_host->lock); transport_destroy_device(&rphy->dev); put_device(rphy->dev.parent); @@ -703,9 +704,9 @@ sas_rphy_delete(struct sas_rphy *rphy) device_del(dev); transport_destroy_device(dev); - spin_lock(&sas_host->lock); + mutex_lock(&sas_host->lock); list_del(&rphy->list); - spin_unlock(&sas_host->lock); + mutex_unlock(&sas_host->lock); parent->rphy = NULL; @@ -731,23 +732,28 @@ EXPORT_SYMBOL(scsi_is_sas_rphy); * SCSI scan helper */ -static struct device *sas_target_parent(struct Scsi_Host *shost, - int channel, uint id) +static int sas_user_scan(struct Scsi_Host *shost, uint channel, + uint id, uint lun) { struct sas_host_attrs *sas_host = to_sas_host_attrs(shost); struct sas_rphy *rphy; - struct device *dev = NULL; - spin_lock(&sas_host->lock); + mutex_lock(&sas_host->lock); list_for_each_entry(rphy, &sas_host->rphy_list, list) { struct sas_phy *parent = dev_to_phy(rphy->dev.parent); - if (parent->number == channel && - rphy->scsi_target_id == id) - dev = &rphy->dev; + + if (rphy->scsi_target_id == -1) + continue; + + if ((channel == SCAN_WILD_CARD || channel == parent->number) && + (id == SCAN_WILD_CARD || id == rphy->scsi_target_id)) { + scsi_scan_target(&rphy->dev, parent->number, + rphy->scsi_target_id, lun, 1); + } } - spin_unlock(&sas_host->lock); + mutex_unlock(&sas_host->lock); - return dev; + return 0; } @@ -792,7 +798,7 @@ sas_attach_transport(struct sas_function_template *ft) return NULL; memset(i, 0, sizeof(struct sas_internal)); - i->t.target_parent = sas_target_parent; + i->t.user_scan = sas_user_scan; i->t.host_attrs.ac.attrs = &i->host_attrs[0]; i->t.host_attrs.ac.class = &sas_host_class.class; |